'Looks like we're going to find out' John thought to himself as he prepared for the incoming flood.
The giant let out a guttural moan as semen began to surge through his cock. Lost in pleasure he pushed harder against John's backside. John felt the tip of the giant's hose explode with hot fluid, still deep inside of him. The pressure started to increase on John's insides as the man juice continued flowing rapidly into his body. The warm liquid filled his stomach as a paunch began to form and the giant continued to grind his body against John.
"Ooh, the pressure..." moaned John. The giants feet returned to the floor as his testicles slowly shrank. At the same time John's size was growing, as his midsection rounded out. The growth quickly spread outward from his belly, and his whole torso began to round. John's skin stretched like pliable rubber as the giant continued to pump him full of seed.
At this point John was getting so big that his legs were starting to spread sideways ad the orb of his body grew larger. He lost his footing and rolled forward, his face looking directly into the toilet seat. The giant took advantage of this by leaning farther over, resting almost all of his weight on the giant semen-pillow he was continuing to fill. John's body was taught but still had some give like a giant water balloon. He squished downward under the giant's considerable weight, spreading out sideways to push against both sides of the stall.
"Yeah, just a little more... so good," breathed the giant as he started bouncing his pelvis lightly on the elastic form of John, still buried to the hilt in his ass. The giant gave one last push with his cock, depositing the last of his prodigious load into the John-balloon. John's size had finally become too much for the tiny bathroom stall and the walls burst off their connections to the wall falling sideways and opening the scene to the bathroom. John couldn't believe how full he felt, how full he was! His body was six feet in diameter, roughly the width of a giant beach umbrella. His hands and feet still protruded from his sphere-like body, but his arms and legs had been mostly absorbed and were barely discernible.
The giant pulled out of John, "Wow, that was great, I could get used to this toon world stuff. Lets see what Ralph thinks of you!" His penis was nearly soft now but still hung down to the top of the his calves, having grown substantially during the encounter.
"I don't think I can take any more of this!" John thought as the giant rolled his firm yet elastic form toward the steam room.